Granted in temps below zero on the hill above 12,000 feet I'd opt for the 2, for any other time outdoors being active these are great for me. I actually like the gappping fly referred to earlier because it makes it easy to get out so to speak. When other guys are struggling in the lodge bathroom, your not. I would like a bit more cuff on the ankles but all in all I really appreciate this basee layer!

This is the third pair of silkweights i have owned and although the overall performance is the same, Patagonia has really skimped on the amount of fabric it uses to the cover the fly. Check older ones or any other bottoms they make and you will find that there is less of an overlay and that, for me, leads to more exposure of the privates.

I liked the fit and the weight but the fly is nuts or should I say... no I shouldnt this is a famly site. Any way the fly is like a gaping hole in the front of the pants so if you like to cruse O natural under your tights these are no for you.

I purchased the Capilene 1 for the express purpose of using them as pajama bottoms in my sleeping bag when backpacking. I used to sleep in sweat pants which were too heavy and which made me ah...sweat. The capilene 1 bottoms are light and warm, but not too hot. A perfect solution for me.

I got these as an xmas gift to keep me warm in the chicago winter (moved from atlanta). While they are very thin and light they lack in keeping me warm in the beginning of the chicago winter. SO i opted to return these and upgrade to level 2. I thought about getting level 3 but they cost a little more and I didnt want to get too warm under my clothes.

I love these pants because they are made out of recycled materials and they are super warm. I'm tall so the men’s fit better than the women’s.

My girlfriend enjoyed the fact that the fly had very little fabric overlapping the crotch area leaving me exposed to natures elements, that's good for my girlfriend, but not for an avid outdoor type like me.

These long underwear perform wonderfully. I was pleased with how they felt against my skin too. Very much worth the slight extra cost for a product that lives up to its hype.

These capilene pants rock. The keep you cool on the most strenuous activity. Despite there light weight they are surprisingly warm. I wore them under The North Face Select Convertible pants in 15 degree weather and was very comfortable. Solid piece of gear.

this is my 3rd pair of bottoms, the others ones have worn out due to wearing everyday during two winters in Korea. Super soft, great for skiing, hiking. I usually don't over-heat when I am skiing with these in the spring, they do a good job of not getting too hot. A lot of people have switched to Merino which is also good and now call this crap-a-lene. I think that is crazy, Patagonia still makes a good product.

This is a great base layer for freezing conditions where you know will be working hard on the hill. I have also worn it under my jeans around town when its freezing outside but I'm not planning on bombing anything. They fit snug on me and keep me warm in one of the most brisk windy town in the States.

I wear these on cool days touring or cold days as long underwear under my pants. They are warm and comfortable.